Atomically thin layered NiFe double hydroxides assembled 3D microspheres with promoted electrochemical performances
Atomically thin layered NiFe double hydroxides assembled 3D microspheres with promoted electrochemical performances
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原子薄层状 NiFe 双氢氧化物组装的 3D 微球具有提升的电化学性能
DOI：
10.1016/j.jpowsour.2016.06.090
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发表时间：
2016-09-01
影响因子：
9.2
通讯作者：
Qian, Xuefeng
中科院分区：
文献类型：
--
作者：
Li, Xiaomin;Zai, Jiantao;Qian, Xuefeng
原子厚度（单层/双层）的LDHs通常表现出新的物理化学性质，特别是在表面依赖的能量存储和催化领域。然而，通常报道的二维LDHs的厚度是纳米级的，自下而上合成原子薄的LDHs的报道很少。本文通过合理设计的反应体系合成了高质量的原子薄层nfe - ldhs组装三维微球，其中原子薄结构的形成由释放的碳酸盐阴离子和丁醇的协同作用控制。此外，络合剂和溶剂对LDHs的共沉淀和组装过程也有重要影响。由于原子薄的LDHs纳米片的性质和独特的三维层次结构，所制得的微球在碱性介质中表现出优异的电催化析氧反应（OER）活性，起始过电位（0.435 V，低于普通LDHs）和良好的耐久性。制备的三维nfe - ldhs微球也首次被用作超级电容器材料，在电流密度为1 a g（-1）时显示出1061 F g（-1）的高比电容。(C) 2016 Elsevier B.V.版权所有
LDHs in atomic thickness (mono-/bi-layers) usually exhibit novel physicochemical properties, especially in surface-dependent energy storage and catalysis areas. However, the thickness of the commonly reported 2D LDHs is in nanoscale and the bottom-up synthesis of atomically thin LDHs is rarely reported. Herein, high-quality atomically thin layered NiFe-LDHs assembled 3D microspheres were synthesized via a rational designed reaction system, where the formation of atomically thin building blocks was controlled by the synergetic effects of released carbonate anions and butanol. Furthermore, the complexant and solvents played important effects on the process of coprecipitation and the assembling of LDHs. Due to the nature of atomically thin LDHs nanosheets and unique 3D hierarchical structures, the obtained microspheres exhibited excellent electrocatalytic oxygen evolution reaction (OER) activity in alkaline medium with an onset overpotential (0.435 V, which is lower than that of common LDHs) and good durability. The as-prepared 3D NiFe-LDHs microspheres were also firstly used as supercapacitor materials and displayed a high specific capacitance of 1061 F g(-1) at the current density of 1 A g(-1). (C) 2016 Elsevier B.V. All rights reserved.